Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c9e64381d20b15b3…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5798ed54c662b7937dee6de065e1743f SHA-1: ef49170dcf208be7c36987873ffa8a7ad5538e03 SHA-256: c9e64381d20b15b35b3cceb85a8d830ec0a0e9923eb0b553a1af893f989bb771
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a second-stage payload. The specific obfuscation and lack of clear URLs prevent definitive family attribution.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
fa01febc0651fede31a714d1b91a1239000c5db72939b98c1589c146424c4b43		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
0529c315d882d08e876fbc43593a489bf729301ee6fe97c16f05aa92e10e0c16		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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